    1.1   The calculation example: Splined shaft connection for a lifting gear drive
       1.1.1   Start the calculation module
       1.1.2   The input values
       1.1.3   The calculation
       1.1.4   The results

1.1 The calculation example: Splined shaft connection for a lifting gear drive

We have prepared the following example to guide you through the calculation module. This calculation module refers to: G. Niemann, H. Winter, B.-R. Höhn: Maschinenelemente Band I: Konstruktion von Verbindungen, Lagern, Wellen. Springer Verlag, 3. edition, 2001: p.857 Example 4: Splined shaft for a lifting gear drive.

1.1.1 Start the calculation module

Please login with your user name and your password. Select the module through the tree structure of the Project Manager by double-clicking on the module or clicking on the button ‘New calculation’.

Figure 1.1:

The calculation module ‘Splined shaft’

1.1.2 The input values

A splined shaft connection with a splined shaft according to DIN ISO 14 is given. The safety against pressure is required. For our calculation example the following input values are given:

Diameter $d1$

= 32 mm

Diameter $d2$

= 38 mm

Number of keys

= 8

Key width

= 6

Supporting length $ltr$

= 40 mm

Manufacturing according to tolerance field

= H7/IT7

Application factor

= 1

Nominal operation torque $Tnenn$

= 2400 Nm

Maximum load peak torque $Tmax$

= 2400 Nm with number of load peaks $> 107$ , no alternating torque

Outer diameter of hub $D2$

= 45 mm

Material shaft

= C45 hardened and tempered

Material hub

= C45 hardened and tempered

1.1.3 The calculation

The profile geometry selection

To find the right profile, click on the button ‘Selection’.

Figure 1.2:

The button ‘Selection’

The profile geometry selection is opened.

Select from the listbox ‘Standard geometry data’ the splined shaft profile according to DIN ISO 14 medium series.

Figure 1.3:

The profile geometry selection

You can refine the profile geometry selection by including specific parameters to find the right profile quicker. Just add the diameter $d 1$ , the number of keys as well the key width. Click on the button ‘Search’.

Figure 1.4:

Refine the profile geometry selection

After clicking the button ‘Search’, only one profile remains. Please take over this profile to the main mask with the button ‘OK’.

Figure 1.5:

Profile

Enter ‘40 mm’ for the supporting length $ltr$ .

Figure 1.6:

The supporting length

The tolerance field

Use the listbox to select the tolerance field ‘H7/IT7’.

Figure 1.7:

The tolerance selection

The field ‘Profile’ displays the corresponding tolerance.

Figure 1.8:

Tolerance

Please add now the application factor as well as the nominal operation factor $T nenn$ .

Figure 1.9:

Application factor and nominal operation torque

The load peaks

Activate the load peaks und enter ‘2400’ for the maximum load peak torque $Tmax$ .

Figure 1.10:

The load peaks and load peak torque $Tmax$

Select the number of load peaks from the listbox.

Figure 1.11:

The number of load peaks

The kind of load

There is no change in load direction, so enter the default setting ‘No alternating torque’ for the ‘kind of load’.

Figure 1.12:

The kind of load

Enter the value ‘45 mm’ for the outer diameter of the hub.

Figure 1.13:

Outer diameter of hub

The material of shaft and hub

Select the material ‘C45 hardened and tempered’ for the shaft.

Figure 1.14:

The material for the shaft

Note: In case you need further information on the material, click on the button ‘Material’.

Figure 1.15:

The button ‘Material’

A new window is opened.

Figure 1.16:

The material details

Select the hub material ‘C45 hardened and tempered’ from the listbox.

Figure 1.17:

The material for the hub

1.1.4 The results

The safeties at operation load and maximum load, the pressures for shaft and hub are determined and displayed immediately in the result panel. In general, the results will be calculated and displayed during every input.

Figure 1.18:

The results

For our calculation example the splined shaft is sufficiently dimensioned. In addition, the message window contains the hint that this shaft-hub-connection can be used.

Figure 1.19:

The message window

The documentation: The calculation report

Click on the button ‘Report’ to create a calculation report. The report contains all detailed results and input values. Using the table of contents, all results can be called up very quickly. The report is available in HTML and PDF format. Save the report in HTML format to open the file later in the web browser or in Word for Windows.

To save the report in the HTML format, please select ‘File’ $→$ ‘Save as’ from your browser menu bar. Select the file type ‘Webpage complete’, then just click on the button ‘Save’.
If you click on the symbol ‘Print’, then you can print the report very easily.
If you click on the symbol ‘PDF’, then the report appears in the PDF format. If you right-click on the PDF symbol, you should see the ‘Save Target As’ option. Click on that option and you will see the dialog box for saving the report.

How to save the calculation

Finally, selecting the button ‘Save’ allows you to save the calculation either on the eAssistant server or on your own workstation.

Figure 1.20:

The button ‘Save’

A standard Windows dialog for saving the file on your workstation appears, providing that the options ‘Enable file save local’ in the Project Manager and ‘Local’ in the calculation module are activated.

Note: You must not forget that the calculation module has to be closed to activate the option ‘Enable file save local.’

Figure 1.21:

Windows dialog for saving the file

In case you have not activated this option, a new window is opened and you can save the calculation on the eAssistant server.

Figure 1.22:

Save the calculation

Please enter a name into the input field ‘Filename’ and click on the button ‘Save’. Then click on the button ‘Refresh’ in the Project Manager. Your saved calculation file is displayed in the window ‘File’.

Our manual is improved continually. Of course we are always interested in your opinion, so we would like to know what you think. We appreciate your feedback and we are looking for ideas, suggestions or criticism. If you have anything to say or if you have any questions, please let us know via phone +49 (0) 531 129 399-0 or email eAssistant@gwj.de.

Contents

1.1 The calculation example: Splined shaft connection for a lifting gear drive

1.1.1 Start the calculation module

1.1.2 The input values

1.1.3 The calculation

The profile geometry selection

The tolerance field

The load peaks

The kind of load

The material of shaft and hub

1.1.4 The results

The documentation: The calculation report

How to save the calculation